Home  >  Article  >  php教程  >  PHP常用语法的总结笔记

PHP常用语法的总结笔记

WBOY
WBOYOriginal
2016-06-13 11:06:40823browse

PHP常用语法1.PHP获得字符串长度:

<ol class="dp-xml"><li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">length</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">strlen</font></span><span>($str);   </span></span></li></ol>

PHP常用语法2.PHP判断字符是否为NULL:

<ol class="dp-xml">
<li class="alt"><span><span>if(!$str){     </span></span></li>
<li class=""><span>   echo "false"    </span></li>
<li class="alt"><span>    </span></li>
<li class=""><span>}else {     </span></li>
<li class="alt"><span>   echo "true"    </span></li>
<li class=""><span>    </span></li>
<li class="alt"><span>}    </span></li>
</ol>

PHP常用语法3.link_to的使用:

<ol class="dp-xml"><li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> echo link_to($question-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>getUser(), <br>'user/show?</span><span class="attribute"><font color="#ff0000">id</font></span><span>='.$question-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>getUserId()) </span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>  </span></span></li></ol>

PHP常用语法4.PHP截取字符串:

<ol class="dp-xml">
<li class="alt"><span><span>1.split     </span></span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">arr</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>();     </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">arr</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">split</font></span><span>("/",$str);</span><strong><font color="#006699"><span class="tag"><span class="tag-name">CODE</span><span class="tag">></span><span class="tag"><span class="tag-name">SPAN</span></span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">class</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">php_000000</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>     </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">SPAN</span><span class="tag">></span></font></strong><span>     </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">CODE</span><span class="tag">></span></font></strong><span>    </span>
</li>
</ol>

PHP常用语法5. PHP替换字符串:

<ol class="dp-xml">
<li class="alt"><span><span>1. str_replace("-" , "/" , $str)     </span></span></li>
<li class=""><span>"-" = 要替换的字符     </span></li>
<li class="alt"><span>"/" = 替换后的字符     </span></li>
<li class=""><span>    </span></li>
<li class="alt"><span>2.按数组方式替换:     </span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">arr</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>("0","1","2","3","4","5","6","7","8","9");     </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">repNum2</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">str_replace</font></span><span>($arr,"",$str);  </span>
</li>
</ol>

PHP常用语法6.PHP获取数组长度:

<ol class="dp-xml"><li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">i</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">count</font></span><span>($array_name);   </span></span></li></ol>

PHP常用语法7. PHP获得当前时间:

<ol class="dp-xml"><li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">current_date</font></span><span> = date("Ymd");   </span></span></li></ol>

以上就是我们这次为大家总结的PHP常用语法。


Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn